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First Trust S&P 500 Diversified Dividend Aristocrats ETF Average Annual Total Returns
 12 Months Ended 15 Months Ended 20 Months Ended 60 Months Ended 102 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
S&P 500® Sector-Neutral Dividend Aristocrats Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1],[2]   14.62%    
Nasdaq US 500 Large Cap(TM) Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent   17.32%     13.80% 14.75%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent   17.88% 17.16% 21.77% 14.42% 14.76%
First Trust S&P 500 Diversified Dividend Aristocrats ETF            
Prospectus [Line Items]            
Average Annual Return, Percent   13.98%     10.39% 10.17%
Performance Inception Date Jun. 20, 2017          
First Trust S&P 500 Diversified Dividend Aristocrats ETF | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent   12.70%     9.22% 8.92%
First Trust S&P 500 Diversified Dividend Aristocrats ETF | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent   8.25%     7.65% 7.58%
[1] On October 3, 2023, the Fund’s underlying index changed from the Nasdaq Riskalyze US Large Cap Select DividendTM Index to the S&P 500® Sector-Neutral Dividend Aristocrats Index. Therefore, the Fund’s performance and historical returns shown for the periods prior to this date are not necessarily indicative of the performance that the Fund, based on its current index, would have generated.
[2] Performance data is not available for all the periods shown in the table for the index because performance data does not exist for some of the entire periods.